this exclusive guided tour offers a behind-the-scenes look at the design and construction of Biltmore House in areas unavailable on the regular house visit. The Rooftop Tour provides you with a bird’s eye view after a climb up the Observatory’s spiral staircase and onto the balconies and rooftop of the 250-room house. There are areas that require going through narrow rooms and stairwells.

The centerpiece of the gardens features a seasonal rotation of blooms, including 75,000 tulips in the spring, colorful summer annuals, and fall mums. A long arbor covered with grapevines runs down the center with themed areas, including a butterfly garden, white border, scented border, and Victorian border. four-acre garden designed by famed father of American landscape architecture, Frederick Law Olmsted. Other highlights of the Walled Garden include Victorian, white, and scented borders, along with a butterfly garden
Rose Garden: The lower half of the Walled Garden features 50 varieties of roses grown at the end of the 19th-century, plus modern varieties and All–America Roses. You'll also find traditional garden structures, such as a maypole and double arch surrounded by 2,000 roses, planted exactly as it was when the Vanderbilts lived at Biltmore.

This glass-roofed building built in 1895 nurtures exotic orchids, ferns, and palms and provides flowers and plants for the house just as it did in the Vanderbilts’ time. https://www.biltmore.com/news-release/g ... servatory/

Water was an important aspect of Victorian landscaping, and Olmsted incorporated two elements for the estate: the Bass Pond created from an old creek-fed millpond and the Lagoon. Each was used for guest recreation such as fishing and rowing.